The infographic-style image explains. But the story goes wider in saying that Corvids can and do attack intruders. The second letter below reports on magpies killing ducklings and magpies often attack cats! They think the cats are a danger to their offspring in nests nearby.
I'll add a bit by quoting this letter to The Times in today's newspaper from Dr Mark Taylor of Coalville, Leics, whose letter is headed: Cruelty of nature.
Sir, David Noble's letter (July 15) about the effect that cats can have on the local bird population triggered feelings of guilt over finding the body of a young blackbird on my driveway, one I had been watching with delight for the previous few days as its father fed it. Fearing that one of my seven cats was responsible, I nervously reviewed the CCTV and discovered the assassin to be a jackdaw that had targeted the blackbird mid-flight. Nature indeed read in beak and claw.
Dian Pollock writes to The Times as follows:
Sir, Councils in Australia have introduced curfews on cats at night and strict regulations about identifying trespassing felines. Maybe it's time for one here. We also have issues with magpies. On Monday I saw the last duckling on the University Lake being attacked by one.
Cat owner thought his cat might have killed a blackbird but CCTV showed it was a jackdaw by Michael Broad
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